Sophos Endpoint security: Block all websites except one

Question

I've been trying to find out how to block all websites except one, in an end user, by creating a policy in the Sophos Enterprise Console. I can see an option - Full web control but it requires an appliance. My question is, it is possible block all websites except one with Sophos? I appreciate if anybody knows, and can tell me how. I have downloaded the trial version of Sophos. If it's possible, I'll try Sophos ES for a year, for the end users and servers. 
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Answer 1

Team Folder in the past was managed by administrators. Administrator can create, edit, delete team folders. The team folder can be published to a group of users, including Active Directory group. It is very convenient to share files and folders with a group of users in the same team. As team groups bigger, it may not be convenient for administrator to manage all the team folders. So it makes sense for administrator to assign some users to be able to manage team folder that they own themselves. Role Manager It usually starts with the role manager by creating a role with Add/Edit/Delete permissions and assign it to users or Active Directory groups. Manage Team Folder The user who are in the private team folder role will be able to manage team folders without seeing all the team folders from everyone. Here is a YouTube Video about...